Coal briquette and process of manufacturing the same



PAT liul G White.

CHARLES M. MACHOLID, OF PHILADELPHIA, IENNSYLVANIA.

No Drawing.

T 0 all whom it may concern Be it known that I, CHARLES M. MAoHoLn, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Coal Briquettes and Processes of Manufacturing the Same, of which the following is a specification.

The present invention relates to improvements in the manufacture of briquettes and one object of the invention is to produce a fuel which is free from objectionable odors and gives out no greasy smoke and as a consequence will not tarnish silver and other metal ware, nor spoil furniture and wall paper as is the case with other briquettes. It can therefore be used not only in factories and large heating plants but, being perfectly clean to handle, with great advantage also in dwelling houses.

Another advantage of the invention is to utilize such material in the manufacture of these briquettes as is ordinarily wasted or diificult to burn, such as coal dust and very fine coal. I

The briquettes in accordance with this invention are made in different shapes and sizes most convenient for their intended use as for instance cone-shaped for heaters and bricleshaped for boilers and engines and egg-shaped for stoves.

These briquettes when leaving their moulds are ready for immediate use, whereas briquettes as generally manufactured have to be subjected to a final drying process in ovens, becausethey are made by wet processes.

The steps of manufacture in this new cess are as follows:

First :-Hard pitch in pieces no larger than a cocoa-nut and no smaller than a chestnut are pulverized preferably in a grinder or crushing machine.

Second :The hard pitch powder is now mixed with fine coal or coal dust. The proportions are about 6% of hard pitch to about 92% of coal depending on the amount ofmoisture contained in the coal. The drier the coal, the less pitch is needed.

Third :The mixture o|f coal and hard pitch is now well stirred, preferably in a revolving mixing drum and thereupon Specification of Letters Patent.

pro-

Patented Jan. 31, I922.

Application filed January 28, 1821. Serial No. 440,746.

Fourth :delivered into a funnel-shaped or other sifter, where lumps are removed.

' Fifth :The sifted mixed material, which is of very even size, is now placed in a closed vessel where it is finally stirred and kneaded into a dough while steamed at a tempera ture of 300 to 400 C. If the coal is very dry I may preferably add up to 2% of gly cerlne which prevents the fuel from becoming brittle. In some cases up to 1% paraffine may be added to make the surfaceof the briquettes smooth, particularly if intended for household use. v

Sixth :-\Vhen the dough has become sufficiently pliable it is delivered onto a table or plate where it is divided or out up into pieces or lumps of the proper size for the briquettes.

Seventh :These lumps are then placed in moulds of egg, conebrickor other shape, depending on the ultimate use for which the fuel is intended.

Eighth :and last step of the process.- \Vhile still warm, the material filled in the moulds is now compressed under a ram or plunger in a press where it is subjected to a pressure of about 80 atmospheres which may vary in accordance with the condition of the material used. This gives great solidity and hardness to the briquettes which are now dry and ready for use.

This is a great advantage over hereto'fore known methods as no drying ovens are required to drive the moisture out of the briquettes after they have been formed, nor are any roller presses needed, all of which makes the former methods costly and unsatisfactory.

I claim i 1. A briquette consisting of substantially six per cent hard pitch; two percent glycerin, and the remainder coal. all compressed into a very hard mass.

2 A briquette consisting of substantially six per cent hard pitch. two per cent glycerin, one per cent paraffin, and the remainder coal, all compressed into a very compact mass.

In testimony whereof I afli-x my signature,

CHARLES M. MLA'CHOLi1 

